tag:blogger.com,1999:blog-21402852.post116033296613437486..comments2018-02-18T16:49:54.536+10:00Comments on The NXT STEP is EV3 - LEGO® MINDSTORMS® Blog: HiTechnic Compass sensor availableAsha Seshannoreply@blogger.comBlogger10125tag:blogger.com,1999:blog-21402852.post-1160585582192903612006-10-12T02:53:00.000+10:002006-10-12T02:53:00.000+10:00I think it might require seperate batteries, but n...I think it might require seperate batteries, but not too much. For most applications, you probably don't *want* continuous BT GPS data transmitted. What you'd like is for the NXT to be able to send a message to the GPS *requesting* a position update, and then the GPS unit sending back just that update. Yep, continuous BT pinging will eat in to the battery (I use it in my remote control schemes), but even that isn't needed for most applications.<BR/><BR/>The point about needing custom firmware is a good one, and one I mentioned in passing in an early comment here. I strongly suspect it will need a different firmware, but until I've really poked around in there I'm not going to swear it's dependant on that. I'm still learning new stuff about NXT-G all the time.<BR/><BR/>-- <BR/>Brian DavisBrian Davishttps://www.blogger.com/profile/13348160352741782598noreply@blogger.comtag:blogger.com,1999:blog-21402852.post-1160523328166350402006-10-11T09:35:00.000+10:002006-10-11T09:35:00.000+10:00Hi BrianIf you were using a Bluetooth GPS I hope y...<B>Hi Brian</B><BR/><BR/>If you were using a Bluetooth GPS I hope you were also packing a spare battery. When I recently used a BT GPS with my mobile phone the batteries in both ran down quite quickly.<BR/><BR/>Regarding NXT & BT GPS comms - I think this would require custom firmware. Possibly requiring customising the code running on the Bluetooth subsystem - in order to cope with a continuous connection, rather than the NXT's packet oriented system.<BR/><BR/>Probably not too difficult - at least both devices present a serial port over Bluetooth interface.<BR/><BR/>Ttfn,<BR/>TonyTony Naggshttps://www.blogger.com/profile/06952505225867185961noreply@blogger.comtag:blogger.com,1999:blog-21402852.post-1160421394559773952006-10-10T05:16:00.000+10:002006-10-10T05:16:00.000+10:00With selective avalibility turned off, military is...With selective avalibility turned off, military is civilian... and with a technique called differential GPS, even with the selective avalibility "degraded" signal, you could get to an accuracy of a centimeter or so (I've used this for locating cave entrances - two hours babysitting a couple of laptops with GPS units, or ten hours of fighting through tick-infested backwoods with a compass and clino. i'll take GPS).<BR/><BR/>-- <BR/>Brian DavisBrian Davishttps://www.blogger.com/profile/13348160352741782598noreply@blogger.comtag:blogger.com,1999:blog-21402852.post-1160418991520254052006-10-10T04:36:00.000+10:002006-10-10T04:36:00.000+10:00I don't know if your average GPS can is acurate en...I don't know if your average GPS can is acurate enough for this kind of application. Mine would not work as it only has an acuracy of 10" in good conditions. With such a small robot (or perhaps some really neat sumo contests) you would want it to be much more acurate. Millitary.Maniac (no 000 any more)noreply@blogger.comtag:blogger.com,1999:blog-21402852.post-1160415308265371622006-10-10T03:35:00.000+10:002006-10-10T03:35:00.000+10:00Perhaps this could use it's own thread at some poi...Perhaps this could use it's own thread at some point, but... with selective availability turned off, it's pretty good, and for outdoor navigation, positioning within 30 cm isn't too bad (i.e., could be useful). With *two* GPS-equiped NXTs playing "leapfrog", I can't see a fundamental reason why differential GPS can't provide centimeter-scale accuracy (obviously not really fast, on-the-fly, but still very useful for outdoor navigation). I'm thinking about the SRS Magellen:<BR/><BR/>http://www.robothon.org/robothon/challenge.php<BR/><BR/>This plus RFID tag reading are still very high on my list... I've been thinking about them for the NXT since long before the official announcement that the NXT was even going to be produced.<BR/><BR/>-- <BR/>Brian DavisBrian Davishttps://www.blogger.com/profile/13348160352741782598noreply@blogger.comtag:blogger.com,1999:blog-21402852.post-1160412186120140922006-10-10T02:43:00.000+10:002006-10-10T02:43:00.000+10:00To what degree of accuracy would the GPS be anyway...To what degree of accuracy would the GPS be anyway?David Levyhttps://www.blogger.com/profile/11065061310059529938noreply@blogger.comtag:blogger.com,1999:blog-21402852.post-1160404481162325022006-10-10T00:34:00.000+10:002006-10-10T00:34:00.000+10:00Several of us have wanted to use BT GPS units to a...Several of us have wanted to use BT GPS units to allow the NXT to locate itself. The only big problem right now is getting the NXT to read the BT messages that a GPS unit can send - NXT-G can't seem to do it, and I don't remember if this is a problem that can be solved on top of the standard firmware, or needs a firmware replacement (which we don't have... yet. RobotC doesn't yet support BT, IMS).<BR/><BR/>As to compass sensors in FLL. They would be neat. But are they needed? I don't think so. And the only way they should be allowed is if *every* team has equal access to them. I'm not sure if Hitechnic could supply all the FLL teams by next year, but I'm reasonably certain that they can't this year.<BR/><BR/>-- <BR/>Brian DavisBrian Davishttps://www.blogger.com/profile/13348160352741782598noreply@blogger.comtag:blogger.com,1999:blog-21402852.post-1160401552408385092006-10-09T23:45:00.000+10:002006-10-09T23:45:00.000+10:00Location sensor...I think there could be a way to ...Location sensor...<BR/><BR/>I think there could be a way to connect my GPS with the NXT. Now that would be cool, haveing it send info to my comp via BT so that I can know exaclty where it is at all times. Except that the reange of the BT would prevent it from getting out of site outdoors, and my GPS wouldn't work indoors. Drat.Maniac000noreply@blogger.comtag:blogger.com,1999:blog-21402852.post-1160354670050068312006-10-09T10:44:00.000+10:002006-10-09T10:44:00.000+10:00I'm sure it won't be allowed this year... maybe ne...I'm sure it won't be allowed this year... maybe never. While I love the sensor, there are plenty of methods out there for navigating the playing field that don't require Compass headings. I'm not saying it can't be done, just that software could handle the movement options and free up the port that the compass would use. <BR/><BR/>I think the Compass sensor will find its own niche among those of us who like designing robots that roam and discover... I want to pair it with my Wireless Camera and have it provide feedback to another Brick (or BT-device) about position... <BR/><BR/>JimJim Kellyhttps://www.blogger.com/profile/13876934942928389738noreply@blogger.comtag:blogger.com,1999:blog-21402852.post-1160352722517975102006-10-09T10:12:00.000+10:002006-10-09T10:12:00.000+10:00I'm still curiose about everybody's take on whethe...I'm still curiose about everybody's take on whether or not FLL will allow these in competition. I'm under the impresion that since they are being sold through LEGO, they count as an official LEGO product and don't violate any of those rules. But I think that they will not be allowed for a while yet, at least not until the NXT is the prominent figure in competiotion. Having a compass sensor would be a huge advantage, and since there is only one for the NXT (being sold through LEGO that is) RCX users would be out of luck. What does everyone think?Maniac000noreply@blogger.com